Hey! I have KP - it showed up around your ds's age. And it got TONS worse during pregnancy and after birth.
Be very careful with him in the sun - a sunburn can make it worse, and it doesn't get better when the burn goes away. Also, don't pick at, squish, rub off, scrub, or exfoliate, that just irritates it too!
Some people have success with elimination of dairy (and soy), but it only controls it, does not eliminate KP.
Using a mild soap (cetaphil?) instead of regular or baby soap, using cooler water - no hot baths, and bathing every other day will help with the skin, as will keeping it moisturized. The extra bathing dries out skin faster, as does soap.
There is a lotion that your derm can prescribe that contains lactose (I think, it's been a while since I used it) that helps some people as well.
For me, I've just come to terms with my bumps and go on my way. I was never really teased about it, and it was on my face and arms. Now it's on my face (jaw), upper and lower arms, shoulders, and legs thanks to pregnancy hormones!
But honestly, it may seem so obvious to you and ds, but most people won't even notice it.
Lisa, mama to Lauren, Elliot, angel Marion, and baby due in the fall.